CN104752945A - Short-cavity passively mode-locked laser device - Google Patents
Short-cavity passively mode-locked laser device Download PDFInfo
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- CN104752945A CN104752945A CN201310747549.2A CN201310747549A CN104752945A CN 104752945 A CN104752945 A CN 104752945A CN 201310747549 A CN201310747549 A CN 201310747549A CN 104752945 A CN104752945 A CN 104752945A
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Abstract
The invention discloses a short-cavity passively mode-locked laser device. The short-cavity passively mode-locked laser device comprises a pumping source, a shaping system, a coupling system, a laser gain dielectric, a passively mode-locked absorber and a resonant cavity, all of which are arranged in an optical path; the end face, coupled with pump light, of the laser gain dielectric is a disk-shaped surface; the pump light is reflected to the laser gain dielectric by the coupling system after the pump light is shaped by the shaping system; one part of the pump light goes into the laser gain dielectric for pumping, while the other part of the pump light is reflected back to the coupling system and reflected back and forth a plurality of times between the coupling system and the laser gain dielectric, so that a plurality of pumping points can be formed on the laser gain dielectric; the laser gain dielectric generates stimulated radiation light under stimulated radiation and finally outputs laser. The short-cavity passively mode-locked laser device enables the high-power pump light to be reflected a plurality of times between an aspherical mirror reflector group and a disk-shaped surface, so that the plurality of pumping points can be formed on the laser gain dielectric; as a result, the pump light is effectively absorbed a plurality of times by the gain dielectric at different positions, and the absorption efficiency to the pump light is greatly improved, and consequently, high-power mode-locked output can be realized.
Description
Technical field
The present invention relates to laser technology field, particularly relate to a kind of short cavity laser with active-passive lock mould.
Background technology
Ultrashort pulse (the light pulse below nanosecond
ps-fs) technology is physics, chemistry, biology, optoelectronics, and the subject such as laser spectroscopy is studied microcosmos and discloses the important means of new ultrafast process.
A kind of effective ways producing ultrashort pulse are passive mode lockings.The method is placed on saturable absorber in laserresonator and realizes.Saturable absorber is a kind of non-linear absorption medium, changes with distribution of light intensity the absorption of endovenous laser, and when light field is more weak, absorber is very strong to light absorption, and therefore light transmission rate is very low; Along with the increase of laser intensity, absorber reduces the absorption of light, and when reaching a particular value, light almost can loss-freely pass through, now transmitance almost 100%, thus the larger laser loss of intensity is less, thus obtains very strong mode locking pulse.
Though laser with active-passive lock mould can be used to produce ultrashort pulse, but the power output of the ultrashort pulse of existing laser with active-passive lock mould generation is all smaller.Improving the easiest method of power output is increase pumping light power.But, if just increase pumping light power to improve laser pulse power output, can not realize, because if pumping system is constant, pump light once-through gain medium, along with the increase of pump light, its absorbed power can engender saturated, laser power also occurs saturated, can not increase again.If heat treatment is simultaneously bad, heat can not well shed, and also there will be the serious consequence that laser output power declines.
Summary of the invention
For solving the problem, the present invention proposes a kind of short cavity laser with active-passive lock mould realizing high power locked mode and export.
For achieving the above object, the technical scheme that the present invention proposes is: a kind of short cavity laser with active-passive lock mould, comprise the pumping source, orthopedic systems, coupled system, gain medium, the passive mode locking absorber resonant cavity that arrange according to light path, the end face of described gain medium coupling pumping light is disk-like surface; Described coupled system can form multiple pumping point by pump light multiple reflections to the disk-like surface of gain medium; The pump light that pumping source sends reflexes on gain medium by coupled system after orthopedic systems shaping, part pump light enters gain medium and carries out pumping, part is reflected back toward coupled system, and repeatedly come and go between coupled system and gain medium, gain medium is formed multiple pumping point, such pump light is repeatedly effectively absorbed by gain media diverse location, substantially increases the absorption efficiency to pump light; Gain medium stimulated radiation produce excited radiation light, incide passive mode locking absorber, in resonant cavity vibration and by resonant cavity Output of laser; Gain medium and passive mode locking absorber are positioned at resonant cavity.
Further, described coupled system has multiple reflecting part, after pump light incides coupled system, come and go between each reflecting part and gain medium successively, pump light is reflexed to gain medium by each reflecting part, forms the pumping point corresponding with each reflecting part in its disk-like surface.
Further, described reflecting part is aspherical mirror reflecting surface; Described coupled system comprises multiple aspherical mirror reflecting surface, and multiple aspherical mirror reflecting surface is with circular disk structural arrangement.
Further, the number of described aspherical mirror reflecting surface is four, six or eight; Described aspherical mirror reflecting surface is parabolic lens reflecting surface.
Further, described passive mode locking absorber is located on the direction relative with gain medium disk-like surface, between coupled system and gain medium.
Further, described passive mode locking absorber is coated with the total reflection film of oscillation light away from one end of gain medium, forms the front cavity mirror of resonant cavity; The other end that described gain medium is relative with its disk-like surface is coated with reflects deielectric-coating to pump light total reflection to oscillation light part, forms the Effect of Back-Cavity Mirror of resonant cavity.
Further, described passive mode locking absorber is coated with the part reflectance coating of oscillation light away from an end face of gain medium, forms the Effect of Back-Cavity Mirror of resonant cavity; The other end that described gain medium is relative with its disk-like surface is coated with the deielectric-coating to oscillation light and pump light total reflection, forms the front cavity mirror of resonant cavity; Described coupled system center is a light hole, and the laser that Effect of Back-Cavity Mirror exports exports via this light hole.
Further, described gain medium and passive mode locking absorber are equipped with heat dissipation base; Described heat dissipation base to pump light and oscillation light anti-reflection.
Beneficial effect of the present invention is: utilize the aspherical mirror reflecting surface assembly of circular disk structural arrangement to close the disk-like surface of gain medium, high power pump light is made to carry out multiple reflections between aspherical mirror reflecting surface group and disk-like surface, multiple pumping point is formed in disk-like surface, such pump light is repeatedly effectively absorbed by gain medium diverse location, substantially increase the absorption efficiency to pump light, thus realize the output of high power locked mode.
Accompanying drawing explanation
Fig. 1 is mode-locked laser embodiment one structural representation of the present invention;
Fig. 2 is mode-locked laser embodiment two structural representation of the present invention;
Fig. 3 is coupled system front schematic view of the present invention.
Reference numeral: 1, pumping source; 2, collimating lens system; 3, coupled system; 301, aspherical mirror reflecting surface; 302, light hole; 4, gain medium; 5, passive mode locking absorber; 6, heat dissipation base.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Short cavity laser with active-passive lock mould of the present invention, by designing the structure of coupled system and gain medium pump light incident end face, large power pumping optical is made repeatedly to come and go reflection between coupled system and gain medium, thus large power pumping optical repeatedly can be entered gain medium form multiple pumping point, repeatedly effectively absorbed by the diverse location of gain medium, effective raising pumping efficiency, finally realizes high power locked mode and exports.
Concrete, embodiment as shown in Figure 1, this short cavity laser with active-passive lock mould, comprises the pumping source 1, orthopedic systems, coupled system 3, gain medium 4, passive mode locking absorber 5 resonant cavity that arrange according to light path.Wherein, the end face of gain medium 4 coupling pumping light is disk-like surface; Coupled system 3 can form multiple pumping point by pump light multiple reflections to the disk-like surface of gain medium 4; The pump light that pumping source 1 sends is through reflexing on gain medium 4 by coupled system 3 after orthopedic systems shaping, part pump light enters gain medium 4 and carries out pumping, part is reflected back toward coupled system 3, and so repeatedly come and go between coupled system 3 and gain medium 4, gain medium 4 is formed multiple pumping point; Gain medium 4 stimulated radiation produce excited radiation light, incide passive mode locking absorber 5, in resonant cavity vibration and by resonant cavity Output of laser; Gain medium 4 and passive mode locking absorber 5 are positioned at resonant cavity.
This coupled system 3 has multiple reflecting part, after pump light incides coupled system 3, come and go between each reflecting part and gain medium 4 successively, pump light is reflexed to gain medium 4 by each reflecting part, forms the pumping point corresponding with each reflecting part in its disk-like surface.As in the present embodiment, reflecting part is aspherical mirror reflecting surface 301, and this coupled system 3 comprises multiple aspherical mirror reflecting surface 301, multiple aspherical mirror reflecting surface 301 with circular disk structural arrangement, as shown in Figure 3.Preferably, the first reflecting part A, the second reflecting part B, the 3rd reflecting part C, the 4th reflecting part D, the 5th reflecting part E, the 6th reflecting part F, the 7th reflecting part G and the 8th reflecting part H is followed successively by for coupled system 3, eight aspherical mirror reflectings surface 301 that eight aspherical mirror reflectings surface 301 form.The aspherical mirror reflecting surface 301 of each reflecting part can adopt parabolic mirror surface, can by the collimated light reflect focalization that incides on it to gain medium 4.
Its pumping process is as follows: pump light is through orthopedic systems shaping, the present embodiment incides in the parabolic mirror surface of the first reflecting part A of coupled system 3 after collimating lens system 2 collimates, by the first reflecting part A reflect focalization to the first pumping point in gain medium 4 disk-like surface, a part is absorbed by gain medium 4 carries out pumping, a part is incided the second reflecting part B by after the reflection of the disk-like surface of gain medium 4, this reflected incident light is converged to again the second pumping point in gain medium 4 disk-like surface by the second reflecting part B, another part pump light is absorbed by gain medium 4 and carries out pumping, remainder is reflexed to the 3rd reflecting part C of coupled system again by the disk-like surface of gain medium 4, by that analogy, residual pump light another part after the 3rd reflecting part C reflect focalization to the 3rd pumping point in gain media 4 disk-like surface is reflected onto the 4th reflecting part D of coupled system ... eventually pass through the multiple reflections of coupled system 3, gain medium 4 is formed multiple pumping point, each pumping point is mutually corresponding with each reflecting part of coupled system 3.Because gain medium 3 surface adopts disk-like structure to coordinate heat dissipation base, can efficiently radiates heat, coordinate the multiple reflections of coupled system 3 to form multi-point pump on gain medium 4 simultaneously, therefore pumping gross power can be very large, such as tens watts, also there will not be power output saturated or due to the power drop of the higher appearance of temperature, and pump light repeatedly effectively can be absorbed by gain media diverse location like this, substantially increase the absorption efficiency to pump light, thus realize the output of high power locked mode.
Produce stimulated radiation after gain medium 4 absorptive pumping light, in resonant cavity, form vibration, passive mode locking absorber 5 pairs of intracavity modal carry out selection and form narrow linewidth, high repetition frequency output.In this embodiment (embodiment one as shown in Figure 1), passive mode locking absorber 5 is located on the direction relative with gain medium 4 disk-like surface, between coupled system 3 and gain medium 4.Wherein, passive mode locking absorber 5 is coated with the total reflection film of oscillation light away from one end of gain medium 4, forms the front cavity mirror of resonant cavity; The other end that gain medium 4 is relative with its disk-like surface is coated with reflects deielectric-coating to pump light total reflection to oscillation light part, forms the Effect of Back-Cavity Mirror of resonant cavity.Oscillation light through at resonant cavity interior resonance, and by Effect of Back-Cavity Mirror (other end that gain medium 4 is relative with its disk-like surface) Output of laser.
Or, embodiment two as shown in Figure 2, passive mode locking absorber 5 is coated with the part reflectance coating of oscillation light away from an end face of gain medium 4, forms the Effect of Back-Cavity Mirror of resonant cavity; The other end that gain medium 4 is relative with its disk-like surface is coated with the deielectric-coating to oscillation light and pump light total reflection, forms the front cavity mirror of resonant cavity; And coupled system 3 center is a light hole 302, as shown in Figures 2 and 3, the laser that Effect of Back-Cavity Mirror exports exports via this light hole.
In the various embodiments described above, pumping source all adopts high power pumping source, passive mode locking absorber 5 preferred semiconductor saturable absorber (SESAM), and what orthopedic systems adopted is collimating lens system 2.The heat dissipation base 6 of good heat dispersion performance also all can be set on gain medium 4 and passive mode locking absorber 5, to strengthen the heat dispersion of laser; This heat dissipation base 6 pairs of pump lights and oscillation light anti-reflection, any side or the end face of passive mode locking absorber 5 can be located at, and/or be located at other sides except disk-like surface of gain medium 4 or end face.If heat dissipation base is positioned on front cavity mirror, during as front cavity mirror heat dissipation base, also can be metal heat-dissipation block, not to pump light or oscillation light anti-reflection.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; in the form and details to the various changes that the present invention makes, be protection scope of the present invention.
Claims (8)
1. a short cavity laser with active-passive lock mould, comprise the pumping source, orthopedic systems, coupled system, gain medium, the passive mode locking absorber resonant cavity that arrange according to light path, it is characterized in that: the end face of described gain medium coupling pumping light is disk-like surface; Described coupled system can form multiple pumping point by pump light multiple reflections to the disk-like surface of gain medium; The pump light that pumping source sends reflexes on gain medium by coupled system after orthopedic systems shaping, part pump light enters gain medium and carries out pumping, part is reflected back toward coupled system, and repeatedly come and go between coupled system and gain medium, gain medium is formed multiple pumping point; Gain medium stimulated radiation produce excited radiation light, incide passive mode locking absorber, in resonant cavity vibration and by resonant cavity Output of laser; Gain medium and passive mode locking absorber are positioned at resonant cavity.
2. short cavity laser with active-passive lock mould as claimed in claim 1, it is characterized in that: described coupled system has multiple reflecting part, after pump light incides coupled system, come and go between each reflecting part and gain medium successively, pump light is reflexed to gain medium by each reflecting part, forms the pumping point corresponding with each reflecting part in its disk-like surface.
3. short cavity laser with active-passive lock mould as claimed in claim 2, is characterized in that: described reflecting part is aspherical mirror reflecting surface; Described coupled system comprises multiple aspherical mirror reflecting surface, and multiple aspherical mirror reflecting surface is with circular disk structural arrangement.
4. short cavity laser with active-passive lock mould as claimed in claim 3, is characterized in that: the number of described aspherical mirror reflecting surface is four, six or eight or more.
5. short cavity laser with active-passive lock mould as described in any one of claim 1-4, is characterized in that: described passive mode locking absorber is located on the direction relative with gain medium disk-like surface, between coupled system and gain medium.
6. short cavity laser with active-passive lock mould as claimed in claim 5, is characterized in that: described passive mode locking absorber is coated with the total reflection film of oscillation light away from one end of gain medium, forms the front cavity mirror of resonant cavity; The other end that described gain medium is relative with its disk-like surface is coated with reflects deielectric-coating to pump light total reflection to oscillation light part, forms the Effect of Back-Cavity Mirror of resonant cavity.
7. short cavity laser with active-passive lock mould as claimed in claim 5, is characterized in that: described passive mode locking absorber is coated with the part reflectance coating of oscillation light away from an end face of gain medium, forms the Effect of Back-Cavity Mirror of resonant cavity; The other end that described gain medium is relative with its disk-like surface is coated with the deielectric-coating to oscillation light and pump light total reflection, forms the front cavity mirror of resonant cavity; Described coupled system center is a light hole, and the laser that Effect of Back-Cavity Mirror exports exports via this light hole.
8. short cavity laser with active-passive lock mould as described in claim 1-4 or any one of claim 6 or 7, is characterized in that: described gain medium and passive mode locking absorber are equipped with heat dissipation base.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310747549.2A CN104752945A (en) | 2013-12-31 | 2013-12-31 | Short-cavity passively mode-locked laser device |
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| CN201310747549.2A CN104752945A (en) | 2013-12-31 | 2013-12-31 | Short-cavity passively mode-locked laser device |
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Cited By (2)
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| CN106356713A (en) * | 2016-10-20 | 2017-01-25 | 武汉市凯瑞迪激光技术有限公司 | Mode locking laser device of rotary gain medium of semiconductor laser device end face pumping |
| CN115347443A (en) * | 2022-10-20 | 2022-11-15 | 中国科学院长春光学精密机械与物理研究所 | Laser device |
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